Document Detail

Metamorphosis delay in Xenopus laevis (Daudin) tadpoles exposed to a 50 Hz weak magnetic field.
MedLine Citation:
PMID:  20070214     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The experiment was performed to prove that exposure to a relatively weak extremely low frequency (ELF) magnetic field retards tadpoles' development. METHODS: Two cohorts of Xenopus laevis laevis (Daudin) tadpoles were exposed during their immature period ( approximately 60 days) to a 50 Hz magnetic field of 63.9 < or = B < or = 76.4 microT rms (root mean square, average values) magnetic flux density in a solenoid. At the same time, as controls, two comparable cohorts were reared in two aquariums remote from the solenoid. Cohorts' degree of development was quantified by daily inspections of animal limbs and attributing them to a stage of the Nieuwkoop and Faber ( 1956 ) classification. The experiment was replicated three times. RESULTS: (a) Mean developmental rate of exposed cohorts was reduced with respect to controls (0.43 vs. 0.48 stages/day, p < 0.001) starting from early larval stages; (b) Exposure increased the mean metamorphosis period of tadpoles by 2.4 days compared with the controls (p < 0.001); (c) Maturation rates of exposed and control tadpoles changed during maturation period; and (d) Important mortality, malformations or teratogenic effects were not observed in exposed matured tadpoles. CONCLUSION: A long-term exposure of X. laevis tadpoles to a relatively weak 50 Hz magnetic field causes a sub-lethal effect that slows down their larval developmental rate and delays their metamorphosis.
Maurizio Severini; Luigi Bosco; Roberta Alilla; Massimo Loy; Maurizio Bonori; Livio Giuliani; Angelico Bedini; Claudia Giliberti; Raffaele Palomba; Simone Pesolillo; Emanuele Giacomozzi; Agostina Congiu Castellano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of radiation biology     Volume:  86     ISSN:  1362-3095     ISO Abbreviation:  Int. J. Radiat. Biol.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-14     Completed Date:  2010-01-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809243     Medline TA:  Int J Radiat Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  37-46     Citation Subset:  IM; S    
Department of Ecology and Economical Sustainable Development, Tuscia University, Viterbo, Italy.
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MeSH Terms
Electromagnetic Fields*
Larva / growth & development,  radiation effects*
Metamorphosis, Biological / radiation effects*
Time Factors
Xenopus laevis / growth & development*

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